Study on the Effect of Phosphorus Concentration in Water Body on the Growth of Scenedesmus obliquus

SONG Guan-ling et al (College of Life Science,Shandong University of Technology,Zibo,Shandong 255049)

Objective The purpose was to study the effect of phosphorus(P)concentration on the growth of Scenedesmus obliquus so as to prevent and control algae bloom breaking out.Method The effect of P was analyzed from several aspects of cells number,increase rate of algae and maximum standing stock of S.obliquus.Result Under common condition of water body,the growth of S.obliquus accelerated along with the increment of P concentration in water body with optimum P concentration being about 2 mg/L.Both low and higher P concentration would play certain limiting function on the growth of S.obliquus.When the P concentration reached 0.02 mg/L in natural water body,it was defined as water eutrophication and the growth of S.obliquus would accelerate along with the input of external P into water body.Generally,the P concentration in water body was lower than 2.00 mg/L.Decreasing the increment of P concentration in natural water body was the fundamental measure to control green algae bloom breaking out.Conclusion The study provided necessary theoretical basis for the comprehensive treatment of algae bloom.